Not Ranked
I've tried Permatex at the slip fit connection on my headers/collectors. It lasted no more than 3 or 4 days before it burned away and/or blew out. The chunks that I found on the ground were clearly burnt. I think the temperatures of the pipes at the header/collector greatly exceed the 400 or 500 deg F intermittent rating on the high temp silicone sealers. I suspect that those that have had success with this method would have had the same success with no sealer at all (those with good flat surfaces).
Chris
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